什么是cost group ?
Its a simple and old traditional technique of divide and conquer.
Its like timing critical paths further bucketed into more smaller groups terms as cost groups.
Once these buclets are created the tool could be any industry standard tool is able to focus better and help achieve PPA closure.
总结就是： 为了实现更好的PPA和性能定义所定义的分组。
例子：
一个芯片中的timing path 可以分成4 个cost group：
■ Input-to-Output paths (I2O)
■ Input-to-Register paths (I2C)
■ Register-to-Register (C2C)
■ Register-to-Output paths (C2O)
对每一个cost group (path group)而言， 最差的timing path 驱动芯片的cost function, 实现对芯片时序和timing, slack等的优化。
原文：https://www.cnblogs.com/yunpengk/p/12970231.html